Can opener



FIG. 1 is a bottom, front, right side perspective view of a can opener showing my new design;

FIG. 2 is a bottom, front, left side perspective view thereof in an open position;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a can opener, as shown and described. 